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Power - Tetrode (NOT beam) (over 1000V 100W) ·Tetrode

8561

High-power transmitting tetrode designed for RF power amplification, linear amplification, oscillation, modulation, or frequency multiplication.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6 V / 3.4 A

Description

The EIMAC 8561/4CX300Y is a rugged ceramic external-anode power tetrode for RF amplifier or oscillator service to 110 MHz.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 6 V
Nominal heater current: 3.4 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Tetrode

X-ray radiationInterelectrode capacitances

Transconductance: 0.012 S
Max plate voltage: 2000 V
Max screen voltage: 300 V
Max plate dissipation: 400 W
Max screen dissipation: 8 W

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1964 RMA EIA

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristics

Heater Voltage
6 V
Heater Current Nominal
3.4 A
ApproximateMidrange
Amplification Factor Grid-to-Screen
4.8 ratio
Nominal
Transconductance
12000 uS
Ia=200mA
Input Capacitance
34 pF
GroundedCathode; Nominal
Output Capacitance
4.45 pF
GroundedCathode; Nominal
Feedback Capacitance Maximum
0.07 pF
GroundedCathode

Other

Maximum Operating Frequency
110 MHz
Maximum Plate Voltage
2000 V
ClassC
Maximum Screen Voltage
300 V
ClassC
Maximum Plate Current
400 mA
ClassC
Maximum Plate Dissipation
400 W
Maximum Screen Dissipation
8 W
Plate Voltage
1000 V
ClassC
Screen Voltage
250 V
ClassC
Plate Current
380 mA
ClassC
Plate Output Power
240 W
ClassC